Explanation: We experience our most intimate moments in close proximity to one another. Even when this is not the case, such as an intimate moment reading a letter that a loved one has written, we still feel close to the letter, which is a proxy for the person.

Possible Origin: That we need to be close to each other to have sex, to hug, to kiss, gives us a very strong relationship to the physical act of closeness to other human beings. This intense physical experience of being close to someone can then be easily translated to our understandings of social relationships. We equate physical closeness with coherence of viewpoints (as well as intimacy) because early on in human development we surrounded ourselves with like minded people. People that were not like minded, were further away, outside the group, in another tribe. This also has coherence with sayings such as, "my inner circle of friends".